For example, if a user wanted to know every time Carl Icahn sent a tweet, all they would have to do is adjust their Twitter settings to make a mobile message, much like a text, appear on their smartphone when he tweeted.

Then go to the Twitter page of the person you wish to get updates from and select the icon left of the "follow" button. Select "turn on mobile notifications" and next time that person tweets, you'll be alerted on your mobile device.